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Supco

Supco M500 Electronic Megohmmeter, Insulation Tester, 0 to 1000 Megohms, for HVAC, Refrigerator Compressors, Motors, Portable Appliances, Relay Circuits, with Soft Carrying Case, Black

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Availability: In Stock.
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Arrives Monday, Jul 13
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Pattern Name: Megohmmeter


Features

  • HIGH VOLTAGE ACCURATE TESTING: This 500 volt megohmmeter measures up to 1000 megohms with a clear LED display, supporting precise electrical testing for insulation in appliances, panel boards, relay control circuits, motors, and more
  • IDEAL FOR HVAC APPLICATIONS: Designed for every HVAC technician using HVAC tools, this insulation tester is ideal for diagnosing hermetic compressors, including refrigerator compressor units and inverter compressors
  • PORTABLE BATTERY OPERATED DESIGN: This handheld electronic tester runs on C size batteries (not included) and features a rugged build with a soft carrying case, allowing convenient insulation checks across condenser and blower motors in the field
  • FAST AND EASY TO READ MEASUREMENTS: The insulation resistance tester includes a clear zone scale and bright LED display to assess insulation condition in ground loop systems, conduit wiring, and complex electrical installations
  • CONSISTENT FIELD PERFORMANCE: The Supco M500 evaluates insulation in circuit boards, transformers, and industrial equipment; Additional applications include circulator pumps, sump pumps, garbage disposal motors, and testing damaged wiring

Description

The Supco M500 Megohmmeter is a compact, 500 volt battery-operated tool designed for accurate insulation resistance measurement in electrical systems when properly connected and used according to product instructions. Featuring a bright LED display and durable handheld design, it is ideal for field use. The Supco Megohmmeter unit serves as a dependable HVAC meter for evaluating hermetic compressors, inverter compressors, condenser and blower motors, and refrigerator compressor systems. Additional applications include: circulator pumps, sump pumps, garbage disposal motors, and insulation testing of damaged wiring. It stands out among electrical meters for testing by delivering precise readings up to 1000 megohms with simple operation. This megohmmeter insulation tester also functions as a resistance meter for checking insulation in transformers, circuit boards, and wiring. It works effectively as a compressor tester and motor tester, helping identify insulation issues before equipment failure. Part of essential electronic test equipment, it can also be used as a portable appliance tester and relay circuit tester for panel boards, control circuits, and conduit wiring. Runs on C size batteries (not included) it comes with 6” test leads that store in the supplied soft carrying case. It is built for convenience and portability. Specifications Indicator range: 20 to 1,000 Megohms Applied voltage: 500 volts Display: LED’s Dimensions: 3-3/8” x 6-3/8” x 1-3/4” Power source: (2) “C” batteries (not included) Test leads: 24” long with alligator clip and magnet

Brand: Supco


Power Source: Battery Powered


Style: Electronic


Color: Black


Item dimensions L x W x H: 9.3 x 6 x 1.8 inches


Power Source: Battery Powered


Minimum Operating Voltage: 500 Volts (AC)


Upper Temperature Rating: 120 Degrees Fahrenheit


Measurement Type: Ohmmeter


Style Name: Electronic


Color: Black


Item Dimensions: 9.3 x 6 x 1.8 inches


Brand Name: Supco


Model: M5462


UPC: 687152021116 696738035638 094700775078


Manufacturer: Supco


Global Trade Identification Number: 16


Part Number: M500


Unit Count: 1.0 Count


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Jul 13

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Magnets on ends of terminal leads are an amazing feature
I bought this Supco M500 tester to validate the motor on our sander. I was blown away by the portability, compactness, and the magnets on the ends of the leads. I also bought a competing unit with higher voltage and a display to tell me actual values, but I am very conflicted because the thought that went into this Supco unit is so great. In terms of a unit that is quick, easy to use, this Supco device wins, hands down. I could see the shorter leads being an issue eventually, but they're that short because they fold up in the back of the unit. I can't stress enough how convenient the magnets on the end of the aligator clips are. I can pop them onto screw terminals and very quickly test through a bunch of circuits without having to hold my fingers in the danger zone or question whether I slipped and caused an incorrect reading. ... show more
Reviewed in the United States on June 1, 2026 by a shameless wag
    • Reliable, Accurate, and Built for the Job Reliable, Accurate, and Built for the Job
Review Image by Marvin
Review Image by Marvin
As a technician, having a dependable megohmmeter is a must — and this one delivers. Right out of the box, the build feels solid, with a rugged, rubberized housing that gives confidence it can handle the field. I’ve used it for testing motors, compressors, and insulation on wiring, and the readings are consistent and accurate every time. The display is bright and easy to read, even outdoors. I also appreciate the auto-discharge feature after testing — a safety must. The leads are quality too, with strong alligator clips that hold securely during testing. ... show more
Reviewed in the United States on June 23, 2025 Reviewed in the United States on June 23, 2025 by Marvin
    • The right tool for the right job.
This tool allowed me to troubleshoot and repair my air conditioner and saved me a lot of time and money.
Reviewed in the United States on November 24, 2025 by Red Barron
    • Really quick to use show customer in a manner they can understand that they're compressor is bad
One of the easiest, and quickest ways to test a compressor and insulation on the windings
Reviewed in the United States on February 20, 2026 by mike
    • Excellent value for money
Excellent value for money. I work in commercial industrial A/C and megging out motors is something I do on a regular basis. This thing is fairly accurate, I've tested it alongside a $1500 AEMC unit and it worked just fine. I wouldn't recommend it on stuff much bigger than 25hp. It's simply not precise enough to keep a trending log. However for small compressors, blower motors, etc, it works great. It's also good for testing wiring inside units for those "intermittent" electrical issues we love to run across. Downside, the leads are far too short. ... show more
Reviewed in the United States on September 4, 2014 by Super tech
    • SUPCO brand is known throughout the industry. It is a trusted name.
This item mega OHM meter is what I needed for diagnosing mini split system systems… it is required for testing the windings of a mini split compressor
Reviewed in the United States on May 23, 2026 by Michelle & Don Hill
    • Works as it should
Great value and fits in my toolbag. I use it often checking compressors and motors.
Reviewed in the United States on March 7, 2026 by Red Rob
    • Cheap, reliable and simple. Love it.
I've been using these at work and love them. Light weight, simple to use and reliable. This will not get down to the finer details of measuring resistance readings but will tell you where the weak spots are in a circuit. The lower cutoff point on this meter's scale is 20 Megaohms, well above levels I have seen circuits operating without tripping overloads or breakers. All of the problem circuits I've diagnosed with my expensive Fluke megger have shown less than 1 Megaohm from conductor to ground. I still love this meter, though, because it is so light and compact. I also like that I can attach the alligator clips and leave one hand free to wiggle wires in the conduit on intermittent problems while I press the test button with the other. I have thus far not misdiagnosed a motor with this meter but I usually go get my Fluke 1507 if I am in doubt. You will love this megger. ... show more
Reviewed in the United States on December 3, 2019 by Secret Agent Hill Billy

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